var arr =['火猪','老八','撤硕','美汁汁','汉堡','臭豆腐','老干妈','韭菜花','六舅',]
console.log(arr.join(','));
var arr = [[1, 2, 3], [400, 500, 600], '-'];
var x = 500;
console.log(x)
var arr = ['A', 'B', 'C', 1, 2, 3];
console.log(arr.join('¿'));
var arr = ['A', 'B', 'C', 1, 2, 3];
arr.join('是猪'); 
console.log(arr.join('是猪'));